I remember when 510's first came out and they were the most recommended device on the market. Then the ego's came out and people love them. Me not so much. They are just another disposable battery to me. I suppose the twist is a step up but still disposable. When the battery dies and it will, it's going in the recycle bin.
I know this goes against what many people say but it's honestly the advice I wish I had received when I started.
Go with a true APV a big battery mod. Like the lava tube or if you have the money the Provari. In the long run it will save you money and make it more likely that you will quit for good. Too many people last about 6 months and then when something breaks or they have one of those days when they just can't get anything to work they go buy a pack and that is it.
Anything that uses an 18650 battery will last all day without having to replace no matter how much you chain vape. Add a vivi nova to that and you have great flavor all day long as well.
Something like this would do the trick.
Variable Voltage 1.5 Mod Kit - Smoke Anywhere For Penny's, LLC Store
If you are not interested in variable voltage and are really on a budget try this. (17 bucks), get your vivi nova, batteries and charger from Got Vapes)
Mountain Vaporizer 18650 Battery Tube
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Like I said this is not going to be the most popular advice, but it is what I wish I had been told from day one. It takes so much of the frustration out of the equation and who needs frustration when you are trying to quit cigs?
If you stick with little batteries you will get frustrated, if you get frustrated you might holler at your boss, if you holler at your boss you might get fired, if you get fired you might end up homeless, if you end up homeless you might have to sell your blood for a pack of smokes. Don't sell your blood for a pack of smokes, buy a big battery mod.
Ps buy back ups for your backups and never run out of juice, order everything well in advance. Redundancy is your friend.